<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>作业2</title>
  <style>
  	* {
  		padding: 0;
  		margin: 0;
  	}
  	.box {
  		width: 200px;
  		height: 150px;
  		background-color: #008080;
  		animation: move 5s infinite;

  	}
  	@keyframes move {
  		0% {
  			transform: translateX(0);
  		}
  		25% {
  			transform: translateX(500px);
  		}
  		50% {
  			transform: translate(500px,500px);
  		}
  		75% {
  			transform: translate(0px,500px);
  		}
  		100% {
  			transform: translateY(0);
  		}
  	}
  </style>
</head>
<body>
  <div class="box"></div>
</body>
</html>